Speaker
Juan Carlos Bueno Sanchez
(Universidad Antonio Narino, Colombia)
Description
The contribution of cosmological vector fields to the CMB is strongly constrained by the bound on the anisotropy parameter g, allowing a direction-dependent contribution only to a puny 0.2% level, thus establishing the global isotropy of the CMB to high precission. In this talk I present a scenario whereby a vector field, produced during inflation and free from ghost and perturbative instabilities, avoids this anisotropy constraint by imposing an observable direction-dependent perturbation on relatively small patches of the CMB only. I describe the scale-dependent statistical distribution of the curvature pertubation contributed by the vector field and discuss the naturalness of the setting and its implications.
